CN1591604A - Recording control unit, recording and reproducing device, and recording control method - Google Patents

Recording control unit, recording and reproducing device, and recording control method Download PDF

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Publication number
CN1591604A
CN1591604A CNA2004100477977A CN200410047797A CN1591604A CN 1591604 A CN1591604 A CN 1591604A CN A2004100477977 A CNA2004100477977 A CN A2004100477977A CN 200410047797 A CN200410047797 A CN 200410047797A CN 1591604 A CN1591604 A CN 1591604A
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signal
maximum likelihood
likelihood decoding
reliability
record
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CNA2004100477977A
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CN1314014C (en
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宫下晴旬
中岛健
木村直浩
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting
    • G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • G11B20/10111—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom partial response PR(1,2,2,1)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10481—Improvement or modification of read or write signals optimisation methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00456—Recording strategies, e.g. pulse sequences
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

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  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Error Detection And Correction (AREA)

Abstract

A recording control apparatus includes a waveform rectification section for receiving a digital signal generated from an analog signal representing information reproduced from an information recording medium, and rectifying a waveform of the digital signal; a maximum likelihood decoding section for performing maximum likelihood decoding of the digital signal having the waveform thereof rectified, and generating a binary signal representing a result of the maximum likelihood decoding; a reliability calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the digital signal having the waveform thereof rectified and the binary signal; and an adjusting section for adjusting a shape of a recording signal for recording the information on the information recording medium based on the calculated reliability.

Description

Recording control apparatus, record and transcriber and record control method
This non-provisional application is based on the NO.2003-108821 of Japanese patent application formerly that meets 35U.S.C § 119 (a) that submitted on April 14th, 2003 and require its right of priority, and its full content is included in this as a reference.
1. technical field
The present invention relates to a kind of recording control apparatus, a kind of record and transcriber, and a kind of record control method that uses maximum likelihood decoding.
2. background technology
Be used on a portable recording medium, writing down initial number information or reproduce certain recording of information and transcriber from a portable recording medium, even in each device and recording medium, use identical shaped recording impulse, but may there be a deviation in the shape of the mark that forms on medium.Significant difference in this signal quality that causes being reproduced.For fear of because variation reduces reliability, for example, when recording medium is mounted, carry out a rectification operation.The rectification operation is a kind of control operation that is used to optimize the feature setting of playback system, the shape of recording impulse etc., to guarantee the reliability of user data.
General information reproduction apparatus comprises a PLL circuit, is used for extracting the clock information that is included in a reproducing signal and based on the clock information identification original digital information that is extracted.
Figure 14 shows a kind of traditional CD drive.To convert reproducing signal to by the light of CD 17 reflections by a shaven head 18.Reproducing signal is by waveform equalizer 19 rectification shapes.By a comparer 20 with synthetic reproducing signal binarization.Usually, thus the threshold value of comparer 20 is fed control that to make the accumulation results of the binary signal output of output be 0.Phase comparator 21 obtains the phase error between binary signal output and the reproduction clock.By the balanced phase error of a LPF22, determine the control voltage of VCO23 based on this result.Thereby phase comparator 21 is fed control and makes phase error always 0 by phase comparator 21 output.Thereon in the recording medium with the mode recorded information of heat, before mark is recorded and afterwards, the shape of the mark of Xing Chenging is disturbed according to the heat of medium and logging mode and is changed thereon.Therefore, must be provided with for the record in every kind of pattern is best recording parameters.
Above-mentioned error testing output is an index that is used for the evaluate recorded parameter.Thereby recording parameters is set up and makes error testing output as much as possible little.Special the, record compensating circuit 27 generates the pulse that has based on the designated mode of recording geometry, and this recording geometry is to use an initial recording parameters that is provided with from 26 outputs of pattern generative circuit.Laser drive circuit 28 recorded information on CD.When reproducing in information has a track of designated mode record from it, error-detector circuit 24 accumulations are from the output of comparer 20 with from the absolute value of the phase error of asking of the output of VCO23, thereby obtain a detection signal.This detection signal is relevant with the shake of reproducing between the clock and the binarization edge of a pulse.Record is repeated to carry out with reproducing with different recording parameterses.At detected value is the recording parameters that the recording parameters that hour uses is confirmed as an optimization.
Figure 15 shows the concrete operations of error-detector circuit 24.Here, use has 6T, 4T, the logging mode of the repetition of 6T and 8T.Mark end edge corresponding to a pattern of 4T mark and 6T combination at interval is optimised.Suppose that the recording parameters of use optimizing writes down the mark beginning edge corresponding to a pattern of 8T mark and 6T combination at interval, and corresponding to the mark end edge of a pattern of 8T mark and 6T combination at interval.
When the NRZI signal in the cycle shown in given one (a) part with Figure 15, record compensating circuit 27 generates the laser waveform pulse shown in (b) part of a Figure 15.Tsfp is a parameter that is used to set a mark starting position, and Telp is a parameter that is used to set a mark end position.Laser drive circuit 28 is adjusted light emitting power according to pattern shown in (b) part of Figure 15.On the track shown in Figure 15 (c) part, physically form a non-crystalline areas by laser.When Telp is changed to Telp1, when Telp2 and Telp3, the shape that mark forms being changed like that shown in (c) part of Figure 15.Information regeneration from the track with such mark will be discussed below.
When the recording parameters at 4T mark end was Telp2, Telp2 was an optimal value, obtained the reproducing signal of (d) part shown in the solid line of Figure 15.Defining a threshold value, is 0 thereby make the accumulated value from comparer 20 outputs.Tested from the output of comparer 20 and the phase differential that reproduces between the clock, and produce reproduce clock ((e) part of Figure 15) thus making the accumulated value of phase error is 0.
When the recording parameters of the end of a 4T mark was Telp1, it was less than optimal value, and (f) part that obtains Figure 15 is with a reproducing signal shown in the solid line.Because the end edge of 4T mark changes on a time-axis direction, the threshold value Tv of comparer 20 little than in the reproducing signal shown in Figure 15 (d) part is as showing with a chain line in (f) part of Figure 15.Because from the change of comparer 20 outputs, it is formerly that the phase place of reproduction clock is compared with the reproduction clock shown in Figure 15 (e) part, is 0 thereby make the accumulated value of phase error.As a result, produce the reproduction clock shown in Figure 15 (g) part.
When the recording parameters of the end of a 4T mark was Telp3, it was greater than optimal value, and (h) part that obtains Figure 15 is with a reproducing signal shown in the solid line.Because the end edge of 4T mark changes on a time-axis direction, the critical value Tv of comparer 20 little than in the reproducing signal shown in Figure 15 (d) part is as showing with a chain line in (h) part of Figure 15.Because from the change of comparer 20 output, the phase place of reproducing clock and Figure 15 (e) reproduction clock shown in partly compare after, be 0 thereby make the accumulated value of phase error.As a result, produce the reproduction clock shown in Figure 15 (i) part.
Mark end edge (rising edge of a reproducing signal) and other measurement result of mistiming of reproducing between the clock (so-called data clock shake) show that (j) part of Figure 15 is to the distribution shown in (i) part.Suppose that here thereby 4T mark end edge and 8T mark end edge have a deviation and make two edges all present the normal distribution of identical deviate.
At the reproducing signal shown in Figure 15 (d) part, and under the situation of reproduction clock shown in Figure 15 (e) part, from the output of comparer 20 and the mistiming between the reproduction clock of mark end edge (rising edge) distribute shown in Figure 15 (K) part like that.At the mean value of the distribution value of 4T mark end edge and at the mean value of the distribution value of 8T mark end edge all is 0.
When the recording parameters of the end of a 4T mark is Telp1 (less than optimal value Telp2), no matter at the mean value of the distribution value of 4T mark end edge, still at the mean value of the distribution value of 8T mark end edge, not 0, but both and the 0 identical distance of all being separated by, shown in (j) part of Figure 15 like that.Therefore, in the total departure of rising edge situation greater than (k) part of Figure 15.
When the recording parameters of the end of a 4T mark is Telp3 (greater than optimal value Telp2), no matter at the mean value of the distribution value of 4T mark end edge, still at the mean value of the distribution value of 8T mark end edge, not 0, but both and the 0 identical distance of all being separated by, shown in (l) part of Figure 15 like that.Figure 15 (j) part and (l) in the part all is squeezed in the distribution of 4T mark end edge with in the distribution of 8T mark end edge.In this situation, in the total departure of rising edge also greater than situation of (k) part of Figure 15.
When the accumulation results of the absolute value of phase error was error testing output, the error testing value shown in (m) part of Figure 15 changed consistent with the variation of recording parameters Telp.Accordingly, recording parameters is changed, and when being hour from the output of error-detector circuit 24, recording parameters is confirmed as one and optimizes recording parameters.
In above-mentioned example, optimised at the recording parameters Telp of the terminal edge of 4T mark.For other recording parameters, carry out the detection record of using special parameter separately, and the recording parameters that obtains optimization based on error-detecting output.
Figure 16 is a process flow diagram that the operation that is used to obtain all recording parameterses has been described according to said process.Visit the zone (S161) that to carry out the medium of detection record on it, at edge that mark begins or the recording parameters of mark end edge when being changed (for example), carry out test record (S163) by the sector by the appointed area.Information is reproduced from the detection record zone, changes the recording parameters region-by-region by the region-by-region and obtains error testing output (S164).In error testing output is hour, and recording parameters is confirmed as one and optimizes recording parameters (S165).Repeat this operation up to obtaining all parameters optimization (S162) (seeing Japanese pending application, publication number NO.2000-200418 and 2001-109597).
The setting recording parameter makes the minimized said method of shake have following problems.In the system of a use maximum likelihood decoding, the probability that error produces may not be minimized.Typically,, from a reproducing signal waveform, estimate a signal mode by maximum likelihood decoding, relatively reproducing signal waveform and the signal waveform that estimates mutually, thus reproducing signal is decoded into have the signal of the signal mode of maximum likelihood.By maximum likelihood decoding, the probability that error produces reduces along with the reducing of difference between reproducing signal waveform and the signal waveform that estimates.
Summary of the invention
According to one aspect of the present invention, recording control apparatus comprises the waveform rectifying part, is used to receive the digital signal of the analogue signal generating of the information of being reproduced from information recording carrier by expression, and the waveform of this digital signal of rectification; The maximum likelihood decoding part is used to carry out the maximum likelihood decoding of the digital signal with rectified waveform, and the binary signal that produces an expression maximum likelihood decoding result; A reliability calculation section is used for the reliability based on digital signal with rectified waveform and binary signal calculating maximum likelihood decoding result; And an adjustment member, be used for being used for the shape of the tracer signal of recorded information on information recording carrier based on the reliability adjustment that calculates.
In one embodiment of the invention, adjustment member is adjusted the shape of the specified portions of tracer signal.
In one embodiment of the invention, adjustment member is adjusted the position at the edge of tracer signal.
In one embodiment of the invention, maximum likelihood decoding part user mode transformation rule is carried out maximum likelihood decoding, this maximum likelihood decoding be by have least polar of 2 be inverted record symbol at interval and equalizing system PR (C0, C1, C0) definite.
In one embodiment of the invention, maximum likelihood decoding part user mode transformation rule is carried out maximum likelihood decoding, and this maximum likelihood decoding is least polar inversion record symbol and equalizing system PR (C0, C1 at interval by having 2, C1, C0) definite.
In one embodiment of the invention, maximum likelihood decoding partly use by have least polar of 2 be inverted record symbol at interval and equalizing system PR (C0, C1, C2, C1, C0) definite state transition rules is carried out maximum likelihood decoding.
In one embodiment of the invention, reliability calculation section is based on digital signal and binary signal computed reliability corresponding to the end of the record mark that forms on information recording carrier.
In one embodiment of the invention, thus adjustment member adjust the shape of tracer signal and improve reliability.
In one embodiment of the invention, adjustment member calculate the accumulated value of the reliability calculated and the mean value of the reliability that calculated in one, based on the shape of one in this accumulated value and mean value adjustment tracer signal.
In one embodiment of the invention, in the mean value of the accumulated value of adjustment member reliability that each combination calculation of record mark length and gap length has been calculated and the reliability that calculated.
According to another aspect of the present invention, record and transcriber comprise reproducing part, are used for producing digital signal from expression by the simulating signal of the information of information recording carrier reproduction; A waveform rectifying part is used to receive this digital signal, and the waveform of this digital signal of rectification; A maximum likelihood decoding part is used to carry out the maximum likelihood decoding of the digital signal with rectified waveform, and the binary signal that produces an expression maximum likelihood decoding result; A reliability calculation section is used for the reliability based on digital signal with rectified waveform and binary signal calculating maximum likelihood decoding result; An adjustment member is used for being used for based on the reliability adjustment that calculates the shape of the tracer signal of recorded information on information recording carrier; And a recording section, be used in adjustment result recorded information on information recording carrier based on the shape of tracer signal.
Still according to another aspect of the present invention, a kind of record control method may further comprise the steps: receive the digital signal and the rectification digital signal waveform that are produced from the simulating signal of the information of information recording carrier reproduction by expression; Execution has the maximum likelihood decoding of the digital signal of rectified waveform, and the binary signal that produces an expression maximum likelihood decoding result; Reliability based on digital signal with rectified waveform and binary signal calculating maximum likelihood decoding result; And the shape that is used for the tracer signal of recorded information on information recording carrier based on the reliability adjustment that calculates.
In one embodiment of the invention, set-up procedure comprises the step of adjusting tracer signal specified portions shape.
In one embodiment of the invention, set-up procedure comprises the step of the position of adjusting the tracer signal edge.
Thereby, might produce advantage among illustrated the present invention here, recording control apparatus is provided, record and transcriber, and the advantage that is used to optimize the record control method of recording parameters when recorded information, thereby the probability that the error when the maximum likelihood sign indicating number is produced is minimum.
Read and describe in detail below the understanding with reference to corresponding accompanying drawing, these and other advantage of the present invention is conspicuous to those skilled in the art.
Description of drawings
Fig. 1 shows a structure according to the record of one embodiment of the invention and transcriber;
Fig. 2 shows has the state transition rules that 2 least polar is inverted a kind of combination of record symbol at interval and PR (1,2,2,1) equalizing system according to one embodiment of the invention based on one;
Fig. 3 show one with the corresponding lattice figure of state transition rules shown in Figure 2;
Fig. 4 A and 4B show the distribution of Pa-Pb, and it has shown the reliability according to the maximum likelihood decoding of one embodiment of the invention;
Fig. 5 A shows 8 kinds of concrete patterns that are used for one embodiment of the invention to 5H;
Fig. 6 A and 6B show the mutual relationship between the record mark displacement of reproducing waveform and pattern-1 when path A is correct path, and Pa-1 is one of 8 concrete paths;
Fig. 7 A and 7B show the mutual relationship between the record mark displacement of reproducing waveform and pattern-1 when path B is correct path, and Pa-1 is one of 8 concrete paths;
Fig. 8 is a form, shows the tabulation with optimised recording parameters;
Fig. 9 is a form, and which figure that shows in 8 kinds of patterns shown in Figure 5 is used to test logging mode shown in Figure 8;
Figure 10 shows the edge transition testing circuit according to one embodiment of the invention;
Figure 11 is a slip chart that the operation of edge transition testing circuit shown in Figure 10 has been described;
Figure 12 shows the logging mode that is used to learn according to one embodiment of the invention;
Figure 13 shows the another kind of edge displacement testing circuit according to one embodiment of the invention;
Figure 14 shows a kind of traditional CD drive;
Figure 15 is a slip chart that a kind of operation of traditional error-detector circuit has been described;
Figure 16 is a process flow diagram that the traditional operation that is used to obtain recording parameters has been described;
Figure 17 shows according to the least polar based on having 2 of one embodiment of the invention and is inverted record symbol and PR (a, b, a) state transition rules of a kind of combination of equalizing system at interval;
Figure 18 shows according to the least polar based on having 2 of one embodiment of the invention and is inverted record symbol and PR (a, b, c, b, a) state transition rules of a kind of combination of equalizing system at interval;
Embodiment
Hereinafter, by by embodiment the present invention being described with reference to the accompanying drawings.
At first, a kind of method of estimating the reproduced signal quality that is obtained by the use maximum likelihood decoding is described.In following example, use to have 2 least polar and be inverted record symbol at interval, thereby and the frequecy characteristic of the waveform of rectified signal signal when record and reproduction be matched with PR (1,2,2,1).
Wherein the instantaneous record symbol is b K, next-door neighbour's tracer signal the preceding is b K-1, formerly the tracer signal of two times is b K-2, formerly the tracer signal of three times is b K-3, with the idea output Level of PR (1,2,2,1) coupling vExpress by expression formula 1.
Level v=b K-3+ 2b K-2+ 2b K-1+ b K Expression formula 1
Wherein K is an integer of representing the time, and V is one from 0 to 6 a integer.
Wherein the state at time K is S (b K-2, b K-1, b K), thereby obtain state transition table (table 1).
Table 1: the state exchange of being inverted a kind of combination of record symbol at interval and PR (1,2,2,1) equalizing system based on least polar with 2T
At the state S of time K-1 (b K-3，b K-2，b K-1) At the state S of time k (b K-2，b K-1，b K) ????B K/Level v
?S(0，0，0) ????S(0，0，0) ????0/0
?S(0，0，0) ????S(0，0，1) ????1/1
?S(0，0，1) ????S(0，1，1) ????1/3
?S(0，1，1) ????S(1，1，0) ????0/4
?S(0，1，1) ????S(1，1，1) ????1/5
?S(1，0，0) ????S(0，0，0) ????0/1
?S(1，0，0) ????S(0，0，1) ????1/2
?S(1，1，0) ????S(1，0，0) ????0/3
?S(1，1，1) ????S(1，1，0) ????0/5
?S(1，1，1) ????S(1，1，1) ????1/6
Wherein, for simplicity, in time K state (0,0,0) KBe S0 K, in time K state (0,0,1) KBe S1 K, in time K state (0,1,1) KBe S2 K, in time K state (1,1,1) KBe S3 K, in time K state (1,1,0) KBe S4 K, in time K state (1,0,0) KBe S5 KThereby, obtain state exchange chart shown in Figure 2.State exchange chart shown in Figure 2 is represented the state transition rules by 2 least polar is inverted at interval and the equalizing system of PR (1,2,2,1) defines.By expanding this state transition graph along time shaft, thereby obtain lattice figure shown in Figure 3.Now, with the state S0 that discusses at time K KWith state S0 at time K-4 K-4Fig. 3 shows can be at state S0 KAnd S0 K-4Between the two states transduction pathway expressed.Wherein such state exchange path is a path A, and path A is along state S2 K-4, S4 K-3, S5 K-2, S0 K-1And S0 KWherein another such state exchange path is path B, and path B is along state S2 K-4, S3 K-3, S4 K-2, S5 K-1And S0 KHere, be (C by time K-6 to the maximum likelihood decoding that time K produces K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K).As (the C that obtains K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(0,1,1, X, 0,0,0) decoded result the time, wherein X is 0 or 1, state exchange path A or B are estimated as has maximum likelihood.Path A has identical likelihood degree with path B, and its state at time K-4 is state S2 K-4Path A or which bar of path B have maximum likelihood can by search (i) at time K-3 to time K reproducing signal y K-3To reproducing signal y KValue and (ii) the difference between the expectation value of the expectation value of path A or path B square accumulated value determine.Wherein (i) is at the reproducing signal y of time K-3 to time K K-3To reproducing signal y KValue and (ii) the difference between the expectation value of path A square accumulated value be Pa, Pa is by expression formula 2 expressions.Wherein (i) is at the reproducing signal y of time K-3 to time K K-3To reproducing signal y KValue and (ii) the difference between the expectation value of path B square accumulated value be Pb, Pb represents by expression formula 3.
Pa=(y K-3-4) 2+ (y K-2-3) 2+ (y K-1-1) 2+ (y k-0) 2 Expression formula 2
Pb=(y K-3-5) 2+ (y K-2-5) 2+ (y K-1-3) 2+ (y k-1) 2 Expression formula 3
Its expression maximum likelihood decoding of difference between Pa and Pb (being Pa-Pb) result's reliability has following implication.When Pa＜＜a maximum likelihood decoding part is selected path A with high confidence level during Pb, and when Pa＞＞during Pb with high confidence level selection path B.In the time of Pa=Pb, selecting path A still is that path B does not note abnormalities.The correct probability of decoded result is 50%.By from decoded result, searching Pa-Pb, to obtain as Fig. 4 A and the represented Pa-Pb distribution of 4B corresponding to a fixed time or a predetermined number of times.
Fig. 4 A shows a Pa-Pb who is stacked on the reproducing signal when noise and distributes.This distribution has 2 frequency crests.A crest is when Pa=0, and another crest is when Pb=0.When Pa=0 the value of Pa-Pb with-Pstd represents, and the value of Pa-Pb is represented with Pstd when Pb=0.Calculate absolute value and the acquisition of Pa-Pb | Pa-Pb|-Pstd.
Fig. 4 B shows one | the distribution of Pa-Pb|-Pstd.Obtain the standard deviation and the mean value Pave of the distribution shown in Fig. 4 B.Wherein the distribution shown in Fig. 4 B is a normal distribution, for example, decoded result | the value of the reliability of Pa-Pb| is-and Pstd or state still less are the state that error occurs, and (σ Pave) uses σ and Pave to represent by expression formula 4 to this probability of error P.This probability of error is the probability of reproducing signal incorrectness after decoding.
P ( σ , Pave ) = erfc ( Pstd + Pave σ ) Expression formula 4
Represent among standard deviation that the probability of error of maximum likelihood decoding result's binary signal can calculate from the distribution of Pa-Pb and the mean value Pave and dope.It is the index that average value P ave and standard deviation can become a reproduced signal quality.In above-mentioned example, supposing | it is a normal distribution that Pa-Pb| distributes.In this distribution is not in the situation of normal distribution, counting | the number of times the when value of Pa-Pb|-Pstd is less than or equal to predetermined reference value.The number that obtains can become the reproduced signal quality index.
Be inverted tracer signal and equalizing system PR (1 at interval by having 2 least polar, 2,2,1) in the state transition rules of Que Dinging, in the state exchange pattern of following quantity, have two possible state exchange paths: 8 kinds of patterns from time K-4 to time K; 8 kinds of patterns from time K-5 to time K; And 8 kinds of patterns from time K-6 to time K.Have the Pa-Pb pattern at one widely in the test specification, it is the degree of reliability.Preferred dependability Pa-Pb is as the index of reproduced signal quality.In this case, needn't test all patterns, have the pattern of high level error probability by only testing, such test result can be used as the index relevant with the probability of error and is used.A kind of pattern with high level error probability is a kind of pattern that reliability Pa-Pb is a low value that has.There are 8 kinds of such patterns, wherein Pa-Pb=± 10.These 8 kinds of patterns and Pa-Pb are summarised in the table 2.
Table 2: the pattern of wherein presumable two kinds of short status transduction pathway
State transitions The reliability of decoded result (Pa-Pb)
Pa＝0 Pb＝0
?S2 K-4→S0 K -10 +10
?S3 K-4→S0 K -10 +10
?S2 K-4→S1 K -10 +10
?S3 K-4→S1 K -10 +10
?S0 K-4→S4 K -10 +10
?S5 K-4→S4 K -10 +10
?S0 K-4→S3 K -10 +10
?S5 K-4→S3 K -10 +10
Based on the reliability Pa-Pb of the decoded result in 8 kinds of above-mentioned patterns, obtain expression formula 5.
Pattern 1
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(0,1,1, X, 0,0,0) time,
Pa-Pb＝(E K-3-F K-3)+(D K-2-F K-2)+(B K-1-D K-1)+(A K-B K)
Pattern 2
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(1,1,1, X, 0,0,0) time,
Pa-Pb＝(F K-3-G K-3)+(D K-2-F K-2)+(B K-1-D K-1)+(A K-B K)
Mode 3
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(0,1,1, X, 0,0,1) time,
Pa-Pb＝(E K-3-F K-3)+(D K-2-F K-2)+(B K-1-D K-1)+(B K-C K)
Pattern 4
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(1,1,1, X, 0,0,1) time,
Pa-Pb＝(F K-3-G K-3)+(D K-2-F K-2)+(B K-1-D K-1)+(B K-C K)
Pattern 5
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(0,0,0, X, 1,1,0) time,
Pa-Pb＝(A K-3-B K-3)+(B K-2-D K-2)+(D K-1-F K-1)+(E K-F K)
Pattern 6
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(1,0,0, X, 1,1,0) time,
Pa-Pb＝(B K-3-C K-3)+(B K-2-D K-2)+(D K-1-F K-1)+(E K-F K)
Mode 7
As (C K-6, C K-5, C K-4, C K-3, C K-2, C K-1, C K)=(0,0,0, X, 1,1,1) time,
Pa-Pb＝(A K-3-B K-3)+(B K-2-D K-2)+(D K-1-F K-1)+(F K-G K)
Pattern 8
As (C K-6, C K-5, C K-3, C K-2, C K-1, C K)=(1,0,0, X, 1,1,1) time,
Pa-Pb＝(B K-3-C K-3)+(B K-2-D K-2)+(D K-1-F K-1)+(F K-G K)
Expression formula 5
Here, Ak=(yk-0) 2, Bk=(yk-1) 2, Ck=(yk-2) 2, Dk=(yk-3) 2, Ek=(yk-4) 2, Fk=(yk-5) 2, Gk=(yk-6) 2Satisfy the Pa-Pb of expression formula 5 from maximum likelihood decoding Ck acquisition as a result.From the distribution of Pa-PB, obtain standard deviation 10With mean value Pave 10Wherein the distribution of Pa-Pb is assumed to be it is a normal distribution, this probability of error P 10By expression formula 6 expressions.
P 10 ( σ 10 , Pave 10 ) = erfc ( 10 + Pave 10 σ 10 ) Expression formula 6
In 8 kinds of above-mentioned patterns, the single place shift error appears.In other patterns, occur 2 or multibit shift error more.The assay value result of process errors pattern shows that most error is a displacement error after the PRML.Therefore, the probability of error of reproducing signal can be estimated by expression formula 6.In this mode, standard deviation 10With mean value Pave 10Can be used as the quality index of reproducing signal uses.
In an embodiment of the present invention, detect above-mentioned 8 kinds of patterns for every kind of logging mode (be used for each combination of mark lengths and the gap length of next-door neighbour before this mark, and for each combination of the gap length after mark lengths and this mark of next-door neighbour).Be identified for optimizing the recording parameters of the marginal position of tracer signal, pay special attention to shape, especially mark beginning edge and the mark end edge of tracer signal.Reliability in all maximum likelihood decoding results of all patterns | among the Pa-Pb|, as long as note having minimum | the pattern of Pa-Pb| value means the edge that only should be noted that record mark.As mentioned above, having Pa-Pb is that the pattern of little value has the high level error probability.Thereby this means the reliability of optimizing the marginal position raising maximum likelihood decoding result of a record mark by part, and optimized whole recording parameterses.A kind of method that is used to optimize the marginal position of record mark will be described below.
Fig. 5 A shows the sample value (pattern 1 is to pattern 8) of 8 kinds of patterns to 5H.This transverse axis express time.A scale is represented a channel clock cycle (TClK).Z-axis is represented signal level (0 to 6).Dotted line is represented path A, and solid line is represented path B.The maximum likelihood decoding that the corresponding reference table 1 of each sample value is described in the above is from the expectation value of Levelv0 to 6.As Figure 15 (c) part with (d) shown in the part, recording section (non-crystalline areas) is expressed as has a signal level that is lower than comparator threshold, because low by the light quantity of the reflection of other parts by the light amount ratio of recording section reflection.A non-recorded part (non--non-crystalline areas) is expressed as has the signal level that is higher than comparator threshold.Fig. 5 A in 8 kinds of patterns shown in Fig. 5 H each pattern corresponding to the reproduction waveform of the border between recording section (mark) and the non-recorded part (at interval) (mark beginning edge or mark end edge).Pattern 1, pattern 2, mode 3 and pattern 4 each corresponding to a mark beginning edge.Pattern 5, pattern 6, mode 7 and pattern 8 each corresponding to a mark end edge.
Use pattern 1 is described the method for the displacement that is used for the test badge beginning edge as an example.
Fig. 6 A and 6B show the reproduction waveform of pattern 1 and the mutual relationship between the record mark displacement.Input signal of " Δ " expression in Fig. 6 A and 6B.Biao Shi path A is a right value state exchange path by a dotted line.This input signal is based on a record mark B1 generation.A record mark A1 has the ideal position of a mark beginning edge.In Fig. 6 A, the mark beginning edge position of record mark B1 is after ideal position.Input signal (y K-3, y K-2, y K-1, y k) sample value be (4.2,3.2,1.2,0.2).Pass through expression formula 7 and the 8 distance P a that obtain between path A and the input signal respectively from expression formula 2 and 3.And the distance P b between path B and the input signal.
Pa=(4.2-4) 2+ (3.2-3) 2+ (1.2-1) 2+ (0.2-0) 2=0.16 expression formula 7
Pb=(4.2-5) 2+ (3.2-5) 2+ (1.2-3) 2(0.2-1) 2=7.76 expression formulas 8
Searching by expression formula 9 | Pa-Pb|-Pstd obtains the quantity and the direction of the displacement of mark beginning edge.
E1=|Pa-Pb|-Pstd=|0.16-7.76|-10=-2.4 expression formula 9
The absolute value that obtains E1 by expression formula 9 is the quantity of displacement, and the symbol of E1 is a direction of displacement.E1=-2.4 in the situation of Fig. 6 A record mark B1.The mark beginning edge position that this means record mark B1 from reference value to backward shift 2.4.
In Fig. 6 B, the mark beginning edge position of record mark B1 is before ideal position.Input signal (y K-3, y K-2, y K-1, y k) sample value be (3.8,2.8,0.8 ,-0.2).Obtain E2 by E2=|Pa-Pb|-Pstd.E2 is 2.4, this means that the mark beginning edge position of record mark B1 shifts forward 2.4 from reference value.
Fig. 7 A and 7B show the reproduction waveform of pattern 1 and the mutual relationship between the wasteful position of record mark.In Fig. 7 A and 7B, the path B that represents by solid line is a correct state exchange path.Here also be with input signal of " Δ " expression.This input signal is based on record mark B1 generation.Record mark A1 has the ideal position of mark beginning edge.In Fig. 7 A, the mark beginning edge position of record mark B1 is after ideal position.Input signal (y K-3, y K-2, y K-1, y k) sample value be (5.2,5.2,3.2,1.2).Obtain E3 by E3=|Pa-Pb|-Pstd.E3 is 2.4.The mark beginning edge position that this means record mark B1 shifts forward 2.4 from reference value.In Fig. 7 B, the mark beginning edge position of record mark B1 is before ideal position.Input signal (y K-3, y K-2, y K-1, y k) sample value be (4.8,4.8,2.8,0.8).Obtain E4 by E4=|Pa-Pb|-Pstd.E4 is-2.4.The mark beginning edge position that this means record mark B1 shifts forward 2.4 from reference value.
With path A wherein be the situation of Fig. 6 A of correct status transduction pathway and 6B and wherein path B be that Fig. 7 A of transfer path of correct status and the situation of 7B compare, the label symbol of expression direction of displacement is opposite.This label symbol depends on the expectation value sequence of correct status transduction pathway and the relation between input signal sequence, and the expectation sequence of other path candidate and the relation between the input signal sequence.When the error between the expectation value of input signal and correct path candidate such as Fig. 6 B and Fig. 7 A so big, the value that obtains by expression formula 9 has a plus sign.Promptly along with the difference between the expectation value of input signal and incorrect path candidate becomes big, the probability of error step-down of maximum likelihood decoding.The direction of displacement of mark beginning edge position that in view of this consideration can the test record mark.When path A was the correct status transduction pathway, pattern 1 was used to test a 2T at interval and the beginning edge of the record mark of the combination of 4T interval or longer mark in pattern 1.When path B was more accurate state transition path, pattern 1 was used to test a 3T at interval and the beginning edge of the record mark of the combination of 3T interval or longer mark in pattern 1.Use said method, obtain the accumulated value or the mean value of each logging mode (being that the long element of each mark/gap length makes up), and a recording parameters is set makes the amount of displacement of beginning edge and end edge position near 0.Thereby realize a kind of record controls that the maximum likelihood decoding recording method is optimized.
To the optimization of a recording parameters be described.The least polar of record symbol is inverted at interval and is represented (in this embodiment, m=2) with m.The gap length before the beginning edge position of the record mark that forms on the information recording carrier can depend on next-door neighbour's record mark and the length of record mark self.For example, when the gap length of next-door neighbour before the record mark is during from mT to (m+b) T, the mark beginning edge position of record mark depends on the gap length before next-door neighbour's record mark.When the gap length of next-door neighbour before the record mark is during greater than (m+b) T, the mark beginning edge position of record mark does not rely on adjacent gap length before the record mark.When the length of record mark self is during from mT to (m+a) T, the mark beginning edge position of record mark depends on the length of record mark self.When the length of record mark self during greater than (m+a) T, the mark beginning edge position of record mark does not rely on the length of record mark self.
The end edge position of the record mark that on information recording carrier, forms can depend on the next-door neighbour after the record mark gap length and the length of record mark self.For example, when the length of record mark self is during from mT to (m+a) T, the mark end edge position of record mark depends on the length of record mark self.When the length of record mark self is during greater than (m+a) T, the mark end edge position of record mark does not rely on the length of record mark self.When the gap length of next-door neighbour after the record mark is during from mT to (m+b) T, the mark end edge position of record mark depends on the gap length after next-door neighbour's record mark.When being close to record mark gap length afterwards greater than (m+b) T, the mark end edge position of record mark does not rely on the gap length after next-door neighbour's record mark.More than, each all is 0 or greater than 0 integer for " a " and " b ", and the least polar of record symbol is inverted bigger than m+a and m+b at interval.
Consider the position of mark beginning edge of a record mark and the position of mark end edge, must on the record mark at contiguous one interval with (m+b) T or littler length, carry out in the optimization of the parameter Tsfp of mark beginning edge.Must on a record mark with (m+a) T or littler length, carry out in the optimization of the parameter Telp of mark end edge.Wherein briefly, m=3, and a=b=3, for 32 kinds of logging modes shown in Fig. 8, this parameter must be optimised.In Fig. 8, for example 2Ts2Tm means in the device to have 2T pattern at interval before next-door neighbour 2T mark.
Which pattern that Fig. 9 shows in 8 kinds of patterns (pattern 1 is to pattern 8) is used to the logging mode shown in the test pattern 8 (being edge pattern).The displacement of signal for example, a corresponding 2Ts3Tm logging mode (figure) 8) uses P3A (Fig. 9) to detect.P3A is that wherein path A is the mode 3 of correct status transduction pathway.The displacement of the signal of 3Ts3Tm logging mode (Fig. 8) uses P1B or P4A (Fig. 9) to detect.P1B is that wherein path B is the pattern 1 of correct status transduction pathway.P4A is that wherein path A is the pattern 4 of correct status transduction pathway.Can recognize from above-mentioned, will change recording parameters, thereby make displacement corresponding to the signal of each logging mode shown in Figure 9 near 0 to the method that is used for the controlling recording parameter of maximum likelihood decoding optimization.
In Fig. 9, cannot detect by in above-mentioned 8 kinds of patterns any one corresponding to the signal displacement of each 2Ts2Tm logging mode (2T that exists before next-door neighbour's 2T mark at interval) and each 2Tm2Ts logging mode (having the 2T interval after the next-door neighbour 2T mark).Therefore, amount of displacement must be optimized by other modes.Yet the 2Ts2Tm logging mode has a relative big reliability Pa-Pb value with the 2Tm2Ts logging mode, therefore is not included in above-mentioned 8 kinds of patterns.In other words, in the mark beginning edge or the mark end edge of the record mark of each 2Ts2Tm logging mode and 2Tm2Ts logging mode, the probability of error is low; Needn't strictly optimize the recording parameters of these logging modes.Therefore, a suitable initial value can be as recording parameters to replace the optimization for the amount of displacement of each information recording carrier.Perhaps, thus it is minimum that 2Ts2Tm logging mode and 2Tm2Ts logging mode can optimisedly make the accumulated value of the phase error of reproducing signal.
Fig. 1 shows according to the record of an example of the present invention and transcriber 100.This record and transcriber 100 are carried out the above-mentioned method that is used to optimize recording parameters.
This record and transcriber 100 comprise reproducing part 101, and recording control apparatus 102, and recording section 103 on record and transcriber 100, can be settled information recording carrier 1.This information recording carrier 1 is used for the information record and reproduces, for example a CD.
Reproducing part 101 comprises optical head 2, prime amplifier 3, AGC4, the balanced device 5 of waveform, A/D converter 6, and PLL circuit 7.Produce a digital signal in the simulating signal of the information that reproducing part 101 is reproduced from expression information recording carrier 1.
Record controls part 102 comprises a rectifying part 8, maximum likelihood decoding part 9, reliability calculation section 10, adjustment member 104.Adjustment member 104 comprises pattern detection circuit 11, edge displacement testing circuit 12, and information recording carrier controller 13.Record controls part 102 is made as for example semi-conductor chip.
Rectifying part 8, for example digital filter receives the digital signal that reproducing part 101 produces, and the waveform of rectification digital signal, thereby makes digital signal have the equalization characteristic of an appointment.
Maximum likelihood decoding part 9 is that for example, a Veterbi decoding circuit is carried out the maximum likelihood decoding of the digital signal with waveform of proofreading and correct by rectifying part 8, and the binary signal that produces an expression maximum likelihood result.
Reliability calculation section 10 is difference system testing circuits for example, based on digital signal with the waveform by rectifying part 8 rectifications and the reliability of calculating the maximum likelihood decoding result from maximum likelihood decoding part 9 output binary signals.In one embodiment of the invention, reliability calculation section 10 is based on mark beginning edge and the digital signal of mark end edge and the reliability that binary signal calculates the maximum likelihood decoding result corresponding to the record mark that forms on information recording carrier 1.
Adjustment member 104 is adjusted the state that is used for the specified portions of the tracer signal of recorded information on recording medium 1 based on the reliability that is calculated by reliability calculation section 10.Adjustment member 104 is for example adjusted the marginal position of tracer signal.By the adjustment of adjustment member 104 executive logging signal conditions, thus raising maximum likelihood decoding result's reliability.Information recording carrier controller 13 is optical disc controllers for example.
Recording section 103 comprises pattern generative circuit 14, record compensating circuit 15, laser drive circuit 16, and optical head 2.Recording section 103 is based on adjustment result recorded information on information recording carrier 1 of tracer signal state.In this example, in reproducing part 101 and recording section 103, all include optical head 2, and the effect that has record-header and reproduce head.Record-header and reproduction head can dispose respectively.The operation of record and transcriber 100 will be described in detail belows.
Optical head 2 generates the simulation reconstruction signal of the information that an expression reads from information recording carrier 1.This simulation reconstruction signal is exaggerated the coupling with AC by prime amplifier 3, then is input to AGC4.Thereby AGC4 adjusts the gain of simulation reconstruction signal makes the output of waveform equalizer 5 (balanced device 5 of waveform will be handled this signal subsequently) have a constant amplitude.Has waveform from the simulation reconstruction signal of AGC4 output by waveform equalizer 5 rectifications.The simulation reconstruction signal that produces outputs to A/D converter 6.A/D converter 6 extracts the simulation reconstruction signal of the reproduction clock synchronization of exporting with PLL circuit 7.PLL circuit 7 reproduces clock from carrying out by A/D converter 6 to extract the digital reproduction signal that obtains of sampling.
The digital reproduction signal of carrying out the sampling generation by A/D converter 6 is input to rectifying part 8.Rectifying part 8 is adjusted the frequency (promptly adjusting the waveform of digital reproduction signal) of digital reproduction signal, thereby the frequecy characteristic that makes digital reproduction signal is to pass through maximum likelihood decoding part 9 in record and recovery time (in this embodiment, PR (1,2,2,1) Jia Ding feature equilibrium characteristic).
9 execution of maximum likelihood decoding part have the maximum likelihood decoding by the digital reproduction signal of the waveform of rectifying part 8 rectifications, thereby generate a binary signal.Reliability calculation section 10 receives digital reproduction signal and the binary signal that has by the waveform of rectifying part 8 rectifications.Reliability calculation section 10 discerns state exchange according to binary signal based on recognition result and branch metric, and obtains expression decoded result reliability | and Pa-Pb|-Pstd (sees expression formula 9; Hereinafter, simply be designated as " Pabs "), it is based on recognition result and branch's yardstick (branch metric).Based on binary signal, pattern detection circuit 11 generates a kind of pulse signal, is used for every kind of logging mode shown in Fig. 9 is distributed above-mentioned 8 kinds of patterns (pattern 1 is to pattern 8), and exports this pulse signal to edge displacement testing circuit 12.Edge displacement testing circuit 12 adds to pattern reliability Pabs one by one cumulatively, obtains the displacement of record compensating parameter according to optimal value (i.e. edge displacement).Information recording carrier controller 13 changes recording parameterses (waveform of tracer signal), and edge displacement quantity that this recording parameters is based on pattern addition one by one is determined change.A record of pattern generative circuit 14 outputs compensating for tilt pattern.
Based on recording parameters from information recording carrier controller 13, record compensating circuit 15 generate with the consistent laser emitting waveform pattern of record compensating for tilt pattern.According to the light transmitted waveform pattern that produces, the Laser emission operation of laser drive circuit 16 control optical heads 2.
Then, the operation of edge displacement testing circuit 12 in this example will be described in detail.Figure 10 shows pattern detection circuit 11 and edge displacement testing circuit 12.Edge displacement testing circuit 12 receives the reliability Pabs that the mode detection result that obtains by pattern detection circuit 11 and the calculating section 10 by reliability calculate.Consider the delay that is produced by pattern detection circuit 11, the reliability Pabs data that are input to edge displacement testing circuit 12 device (FF) that is triggered postpones.Reliability Pabs data corresponding to mode detection output and detection output point are imported into a totalizer, and the pattern test result is input to a selector switch.The selector switch limit is selected to be input to totalizer up to the accumulation results of that acquisition and the result that will select according to test pattern.Totalizer is with the reliability Pabs data addition of accumulation results and new input, and the output addition result.Corresponding to the particular register of test pattern, when receiving an enable signal, store this addition result.
For example, when information was recorded on the information recording carrier, wherein information was address administration one by one, supposed (b) part of using Figure 11 and (c) addition zone gate signal and register enable signal shown in the part.(a) part of Figure 11 shows an address location.In the user area of address one by one, carry out test record when obtaining an edge displacement quantity, must carry out a control with definition addition zone.When the addition zone gate signal shown in Figure 11 (b) part was imported into edge displacement testing circuit 12, addition zone gate signal was input to trigger FF29 by the two-stage trigger shown in Figure 10 and by FFO.In the low area of the addition zone gate signal shown in Figure 11 (b) part,, and addition result is kept in the high zone trigger reset.Produce from the gate signal of addition zone in the register enable signal shown in Figure 11 (c) part.At the end of addition zone gate signal, register enable signal is used for storing addition result into register REG29 to REGO.Represent that the edge displacement quantity data of address is stored in register REG29 to REGO one by one.Because such circuit arrangement, edge displacement test circuit 12 use a totalizer can obtain for optimizing necessary all the edge dislocation amounts of recording parameters.
In the example shown in Figure 10, at the logging mode that is used for test record (for example random pattern), the generated frequency of logging mode is that basis is used to optimize the mark lengths of the required appointment of recording parameters and the combination at interval changes.30 edge displacement quantity of testing (R23T, R33T ... R45L R55L) depends on the generated frequency of logging mode.
PLL circuit 7 shown in Fig. 1 is tested the threshold value of the microtome (not shown) that uses a DC composition (a low frequency composition that is included in the reproducing signal) automatically and is made reproducing signal and reproduce clock signal synchronous.Therefore, the DC that preferably is included in the test record pattern becomes dosis refracta few as much as possible, generates thereby make FEEDBACK CONTROL can not influence the clock of carrying out by PLL circuit 7.Consider the precision that is used to optimize needed time and optimization, preferably use as far as possible little posting field to obtain to have high-precision test result.Therefore, following logging mode needs: have in same frequency and be used for a kind of logging mode that recording parameters is optimized the combination of needed mark lengths/gap length, wherein this coding comprises non-DC composition (DSV), and the generated frequency of each unit area of the required mark lengths of the optimization of recording parameters/gap length combination is high.Figure 12 shows an example of this logging mode.
In Figure 12,2M represents a 2T mark, and 2S represents that a 2T at interval.In this embodiment, at interval each of 30 kinds of patterns of combination generates once in 108 logging modes 2T to 5T mark and 2T to 5T.Comprising the number of symbol " 0 " of 108 logging modes and the number of symbol " 1 " all is 54, and the DSV in logging mode is 0.In Figure 10, by logging mode being applied in the edge displacement testing circuit 12, each pattern can be tested to identical number of times.Thereby obtain the test result of more accurate amount of displacement.In this example, suppose and to use identical recording parameters record 5T or longer mark or 5T or longer interval.
Figure 13 shows an edge displacement testing circuit 12a, and it is a kind of form of revising of edge displacement test circuit 12.In edge displacement testing circuit 12a, random pattern is used to test record.That is, generate different test record patterns in different frequencies.
Pattern detection circuit 11 detects the edge of the every kind of concrete pattern (30 kinds of patterns) shown in Fig. 9.The edge displacement quantity of the corresponding every kind of pattern of edge displacement test circuit 12a accumulation, and calculate every kind of number of times that pattern is tested.The number of times tested by usefulness pattern separately removes each accumulation results of edge amount of displacement, thereby obtains the average edge displacement quantity of each concrete pattern.Thereby even when random pattern is used to detection record, still can determine any pattern is corresponding to the record mark that has reformed mark beginning edge position or mark end edge position.
As mentioned above, be included in edge displacement testing circuit 12 in the adjustment member 104 for each logging mode (promptly for the combination of each mark lengths/gap length) calculate in maximum likelihood decoding result's the accumulated value of reliability or the mean value one, and adjust the state of tracer signal based on the accumulated value that obtains or mean value.
In above-mentioned example, be inverted the state transition rules that the equalizing system of record symbol at interval and PR (1,2,2,1) determines and be used for carrying out maximum likelihood decoding by maximum likelihood decoding part 9 by having 2 least polar.The present invention is not limited to this.The application that the present invention suits for example, is inverted record symbol and PR (C0 at interval by the least polar that has 3, C1, C1, the state transition rules that equalizing system C0) is determined, and be inverted record symbol and PR (C0 at interval by having 2 or 3 least polar, C1, the state transition rules that equalizing system C0) is determined, and be inverted record symbol and PR (C0 at interval by having 2 or 3 least polar, C1, C2, C1, the state transition rules that equalizing system C0) is determined.C0, each is positive number arbitrarily for C1 and C2.
Table 3 shows least polar inversion record symbol and PR (a, b, the state transition rules that equalizing system a) is determined at interval by having 2.Figure 17 shows the state transition graph of an expression state transition rules.Here " a " and " b " each all be positive number arbitrarily.
Table 3: be inverted at interval and equalizing system PR (a, b, the state exchange of the combination of record symbol a) based on least polar with 2T.
At the state S of time K-1 (b K-3，b K-2，b K-1) Input b at time K K Signal level
S(0，0) ?0 ????0
????S(0，0) ????1 ????a
????S(0，1) ????1 ????a+b
????S(1，0) ????0 ????a
????S(1，1) ????0 ????a+b
????S(1，1) ????1 ????2a+b
Table 4 shows least polar inversion interval and PR (a, b, c, b, the determined state transition rules of the record symbol of equalizing system a) by having 2.Figure 18 shows the state transition graph of an expression state transition rules.Wherein " a ", " b " and " c " each all be positive number arbitrarily.
Table 4: be inverted record symbol and PR (a, b, c, b, the state exchange of the combination of equalizing system a) at interval based on least polar with 2T
At the state S of time K-1 (b K-4，b K-3，b K-2，b K-1) Input b at time K K Signal level
S(0，0，0，0) ????0 ????0
S(0，0，0，0) ????1 ????A
S(0，0，0，1) ????1 ????a+b
S(0，0，1，1) ????0 ????B+c
S(0，0，1，1) ????1 ????a+b+c
S(0，1，1，0) ????0 ????B+c
S(0，1，1，1) ????0 ????2b+c
S(0，1，1，1) ????1 ????a+2b+c
S(1，0，0，0) ????0 ????A
S(1，0，0，0) ????1 ????2a
S(1，0，0，1) ????1 ????2a+b
S(1，1，0，0) ????0 ????A+b
S(1，1，0，0) ????1 ????2A+b
S(1，1，1，0) ????0 ????A+b+c
S(1，1，1，1) ????0 ????A+2b+c
S(1，1，1，1) ????1 ????2a+2b+c
Maximum likelihood decoding part 9 can use table 3,4 and Figure 17,18 shown in state transition rules carry out maximum likelihood decoding.
In above-mentioned example, recording parameters is to be used to control the position of mark beginning edge of a record mark and the position of mark end edge.The present invention is not limited thereto.When using the multipulse signal of describing with reference to Figure 15 to carry out Laser emission, the width or cooling pulse (cooling pulse) width of pilot pulse (leading pulse) width, end pulse (terminating pulse) can be adjusted based on the reliability of maximum likelihood decoding.
The unit of record and transcriber 100 can be realized by hardware or software.For example, by more accurate portion 8, maximum likelihood decoding part 9, reliability calculation section 10, and the operation of at least one execution of adjustment member 11 can realize by a computer executable program.
According to the present invention, maximum likelihood decoding result's reliability is based on the digital signal of the waveform with rectification and calculates by the binary signal that maximum likelihood decoding partly produces.Based on this reliability that calculates, the state that is used in the tracer signal of recorded information on the information recording carrier is adjusted.Thereby thereby the state of tracer signal can be adjusted the reliability that improves the maximum likelihood decoding result, thereby and reduces the probability of error in the maximum likelihood decoding time.
According to the present invention, when using the maximum likelihood decoding decoded signal, make probability of error minimum thereby set the parameters optimization that is used for maximum likelihood decoding.Calculate maximum likelihood decoding result's reliability and have the high level error probability for signal section by the reliability that maximum likelihood decoding obtains the maximum likelihood decoding result corresponding to the mark beginning edge of record mark and mark end edge.This calculating is carried out in each mark lengths/gap length combination.Based on result of calculation, obtain to be used to optimize the recording parameters of mark beginning edge position and mark end edge position.Execution information record has reflected the recording parameters that is obtained.By optimizing the recording parameters that has the partial record signal of high level error probability in the maximum likelihood decoding time, can improve the readability of information reproduction.
As mentioned above, the present invention is specially adapted to recording control apparatus, record and transcriber, and the record control method that uses maximum likelihood decoding.
Under the situation of the scope and spirit of the present invention, the various adjustment that those skilled in the art carried out are all conspicuous and be easy to obtain.Therefore, purpose and the scope with appended claim of not lying in are confined to the elaboration here, and should carry out the explanation of broad sense to claim.

Claims (14)

1. recording control apparatus comprises:
The waveform rectifying part is used to receive by the digital signal of expression from the analogue signal generating of the information of information recording carrier reproduction, and the waveform of this digital signal of rectification;
The maximum likelihood decoding part is used for the rectified digital signal of its waveform is carried out maximum likelihood decoding, and produces expression maximum likelihood decoding result's binary signal;
Reliability calculation section is used for the reliability based on rectified digital signal of its waveform and binary signal calculating maximum likelihood decoding result; With
Adjustment member is used for being used for based on the reliability adjustment that calculates the shape of the tracer signal of recorded information on information recording carrier.
2. according to the recording control apparatus of claim 1, wherein adjustment member is adjusted the shape of the specified portions of tracer signal.
3. according to the recording control apparatus of claim 1, wherein adjustment member is adjusted the position at the edge of tracer signal.
4. according to the recording control apparatus of claim 1, wherein maximum likelihood decoding partly uses by having 2 least polar and is inverted record symbol at interval and equalizing system PR (C0) definite state transition rules is carried out maximum likelihood decoding for C0, C1.
5. according to the recording control apparatus of claim 1, wherein maximum likelihood decoding partly use by have 2 least polar be inverted record symbol at interval and equalizing system PR (C0, C1, C1, C0) definite state transition rules is carried out maximum likelihood decoding.
6. according to the recording control apparatus of claim 1, wherein maximum likelihood decoding is partly carried out use and is inverted record symbol and equalizing system PR (C0, C1, C2, C1, C0) maximum likelihood decoding of definite state transition rules at interval by having 2 least polar.
7. according to the recording control apparatus of claim 1, wherein reliability calculation section is based on digital signal and binary signal computed reliability corresponding to the end of the record mark that forms on information recording carrier.
8. according to the recording control apparatus of claim 1, thereby wherein the adjustment member shape of adjusting tracer signal improves reliability.
9. according to the recording control apparatus of claim 1, wherein adjustment member calculate the accumulated value of the reliability that has calculated and the mean value of the reliability that calculated in one, based on the shape of one in accumulated value and mean value adjustment tracer signal.
10. according to the recording control apparatus of claim 9, in the mean value of the accumulated value of adjustment member reliability that each combination calculation of record mark length and gap length has been calculated and the reliability that calculated wherein.
11. record and transcriber comprise reproducing part, the simulating signal that is used for the information reproduced from information recording carrier by expression produces digital signal;
The waveform rectifying part is used to receive this digital signal, and the waveform of this digital signal of rectification;
The maximum likelihood decoding part is used for the rectified digital signal of its waveform is carried out maximum likelihood decoding, and produces expression maximum likelihood decoding result's binary signal;
Reliability calculation section is used for the reliability based on rectified digital signal of its waveform and binary signal calculating maximum likelihood decoding result;
Adjustment member is used for being used for based on the reliability adjustment that calculates the shape of the tracer signal of recorded information on information recording carrier; And
Recording section is used for the adjustment result recorded information on information recording carrier based on the shape of tracer signal.
12. a record control method may further comprise the steps:
The digital signal that reception produces from the simulating signal of expression by the information of information recording carrier reproduction; And the waveform of this digital signal of rectification;
The rectified digital signal of its waveform is carried out maximum likelihood decoding, and produce expression maximum likelihood decoding result's binary signal;
Reliability based on rectified digital signal of its waveform and binary signal calculating maximum likelihood decoding result; And
The shape that is used for the tracer signal of recorded information on information recording carrier based on the reliability adjustment that calculates.
13. according to the record control method of claim 12, wherein set-up procedure comprises the step of the specified portions shape of adjusting tracer signal.
14. according to the record control method of claim 12, wherein set-up procedure comprises the step of the marginal position of adjusting tracer signal.
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